new Species of Coleoptera. 181 



forwarded it to that gentleman, and through his kindness I am 

 enabled to furnish the following particulars relating to the two 

 insects. Although closely allied to the Helluodes Taprobance, the 

 Physocrotaphus Ceylonicus differs both generically and specifically. 

 The general form of the body, large simple mandibles, palpi 

 and maxillae, flattened head and prothorax, and even the striation 

 and punctation of the elytra, agree with Mr. Melly's insect ; the 

 head, however, is not of that disproportionate size, and it wants 

 the two elevated tubercules between the eyes, which are replaced 

 by two oval impressions ; the upper lip has the anterior angles 

 acute, and the basal joint of the antennae is elongate : but the 

 chief character in which it differs from Helluodes consists in the 

 form of the lower lip, the mentum having the central lobe acutely 

 bifid, whilst the labium is short, transversely truncate at the tip, 

 with long setae, and with very distinct lateral paraglossas. This 

 is the more remarkable, because it has the long naked labrum of 

 Helluodes (vol. iv. pi. 21, fig. Ba;|:), which mainly gives that insect 

 a relation with Helluo, whilst the structure of the mentum and 

 labium above described agrees with that of the Feroniides ; still 

 the anterior tarsi, which, although not dilated, are strongly setose 

 on the under side (indicating this specimen to be a male), and the 

 regularly truncate elytra, show an affinity to the Truncatipennes, 

 and render the genera Helluodes and Physocrotaphus two of the 

 most interesting of Carabideous insects. 



Div. TRICHIAD^. 



Genus Fam. TiiicHius, Fab. 



Sub-genus, Dialithus, (Parry). 



Sp. 1. Trichius {Dialithus magnijicus 5.) (Plate XVIII. fig. 4.) 

 Niger, nitidus, clypeo bifido, thoracisque vittis, elytrorum 

 pygidiique maculis, argenteo-opalinis, femoribus anterioribus 

 rufis. 

 Long. Corp. lin. 9 ; lat. corp. lin. 4. 



This is one of the most magnificent species of the group of 

 Melitophila belonging to the genus Trichius. 



With most of the essential characters of the species of Trichius, 

 this beautiful insect presents certain peculiarities which have in- 

 duced me to institute the new section, to which I liave given the 

 name Dialithus, for its reception. Compared with the typical 

 species of Trichius, the most striking points of distinction in the 

 Dialithus magnijicus are the deeply cleft clypeus, the great length 

 and slenderness of the tarsi, and the brilliancy of its colouring. 



